Cement-brick-making machine.



No. 798599. PATBNTED SEPT. 5, 1905.

- W. P. CONRAD.

CEMENT BRICK MAKING MACHINE. APPLICATION FILED SEPT. 17, i904.

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No. 799,599. PATENTBD SEPT. 5, 1905. w. P. CONRAD.

CEMENT BRIGK MAKING IYIAGI'IINE.l

APPLIOATION FILED SEPT. 17. 1904.

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Lamm/toro UNITE STATES vAIENrI OFICE.

VVINBURN F. CONRAD, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE- HALF TO CHARLES A. OWEN, OF INDIANAPOLIS, INDIANA.

CEMENT-BRICK-NIAKING MACHINE.

Speccaton of Letters Patent.

Patented Sept. 5, 1905.

Application led September 17,1904. Sera1No.224,891.

To all whom t may concern,.-

Be itknown that I, WINBURN F. CONRAD, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Cement-Brick-Making Machines, of whichthe following is a specification.

It has been customary heretofore to manufacture building blocks and brick from a mixture of sand and hydraulic cement, but, so far as I am aware, the only successful apparatus for producing such bricks or blocks have been largely hand-operated and not automatic.

The object of my invention is to produce a machine capable of automatically producing in large numbers bricks or blocks of cement mixture; and the fundamental feature of my invention consists in providing means by which the brick and molds may be separated without material pressure upon the brick at the time of separation, thus preventing crumbling of the corners, as isthe case where an 'attempt is made to push a formed brick from a mold.

The accompanying drawings illustrate my invention.

Figure 1 is a side elevation of a machine embodying my invention; Fig. 2. atransverse section, on a larger scale, of a mold and associated parts.

In the drawings, 10 indicates a revolving drum-like structure which carries a plurality of the molding mechanisms. This drum may be of any desired construction and provided with as many molding mechanisms as may be found to be convenient or desirable. Each molding mechanism consists of a radiallymovable mold 11, divided into compartments, each having a cross-section like the cross-section of a brick or block to be molded and of a depth considerably greater than the thickness is flattened in order to receive a pallet-boardL 16. The pallets 16 are held in position by means of suitable hooks 17, pivoted adjacent each mold at the opposite ends thereof on the revolving drum, and each of these hooks on each side is adapted to be engaged by one of a pair of cams 18, carried by the main frame in position to engage the hooks adjacent any mold when that mold has been carried to the lowest position of the drum. The distance between the pallet and the outer ends of the abutments 15 remains constant at all times. Adjacent the cams 18 are cams 19, adapted to engage the extensions 13 of the molds 11 in succession and push said molds inward against the action of springs 14.

Arranged adjacent the periphery of the drum, preferably near the top thereof, is a pressure-roller 20, vertically movable in suitable bearings 21, carried by the main frame, the arrangement being such that the pressure-roller will be rotated by the main drum and will exert its weight upon any material placed in the molds in order to compact the same. Arranged just below the pressureroller 2O and adapted to engage the periphery of the drum 10 is a scraper-plate 22, adapted to remove any surplus of material from the molds and discharge the same into a trough 23, from which the surplus material may be returned to the supply. The molds may be iilled by hand, if desired; but I prefer to arrange an automatic mixing-machine 2A of any desired type above the machine just described. The details of this mixing-machine have not been shown.

The mixer 24 discharges into asubstantially vertical spout 25,'which leadsdownward to the drum in position to discharge into any set -of molds when the same is presented uppermost. The point of discharge of the spout 25 is substantially in the crotch between the drum and the pressure-roller 20, and said spout is provided with a pair of oppositely-operating valves 26 and 27, connected in the usual manner to asingle operating-lever 28, the arrange- IOO ing said loaded pallets, in the drawings said receiving means being shown as an endless carrier 30.

In operation with the parts shown in posi:W

tion in Fig. 1 a complete reciprocation of' the lever 28 will cause a measured quantity of material to pass down through spout 25 and be deposited in the pockets of' the uppermost set of molds 11. The drum is then rotated in the direction indicated by the arrow, and the pressure-roller 2O compacts the material in the molds against the outer ends of the abutment 15. As the drum advances scraper 2Q removes all surplus material and discharges the same into the trough 23, and when the filled mold has passed beyond the scraper an attendant applies a pallet 16, the spring-pressed catches 17 being momentarily retracted to permit such application by cams, the catches 17 serving to hold the pallet in position. At this time a fresh mold is preferably in receiving position. As the drum continues to rotate the extensions 13 of' the filled mold come into engagement with the cams 19, and continued rotation of' the drum serves to gradually retract the mold from the brick, the brick being in the meantime firmly supported between the outer ends of the abutments 15 and the pallet, no material pressure being exerted upon the brick. As a consequence there is no tendency to crush at the corners, and the formed brick comes from the mold with sharp well-defined edges. So soon as the mold 11 has been withdrawn or nearly withdrawn from the brick the catches 17 are engaged by the cams 18, and the loaded pallet drops a very short distance upon the endless carrier 30.

I claim as my invention.

abutment, means for releasing the pallet with its accompanying bricks, and means for bringing the molds successively to filling and stripping positions.

2. In a cement-brick-forming machine, the combination of a rotatable drum, a plurality of open-ended molds carried thereby and movable radially therein, a plurality of abutments f fitting, one in each of said molds, and forming a closure for the inner end thereof, means for securing a pallet adjacent each of said molds in position to form a closure for the outer end of the mold, and means for retracting the mold over its abutment, whereby the mold may be stripped from the brick.

3. In a cement-brick-forming machine, the combination of a rotatable drum, a plurality of open-ended molds carried thereby and movable radially therein, a plurality of abutments fitting one in each of said molds and forming a closure for the inner end thereof', means f'or securing a pallet adjacent each of said molds in position to form a closure for the outer end of the mold, means for retracting the mold over its abutment whereby the mold may be stripped from the brick, a pressure-roller arranged adjacent the drum in position to exert pressure upon a freshly-filled mold.

In witness whereof' I have hereunto set my hand and seal at Indianapolis, Indiana, this 10th day of` September, A. D. 1904.

VVINBURN F. CONRAD. [L s l Witnesses:

CHESTER BRADFORD, JAMES A. WALsH. 

